The bristlecone pine tree, famous for its wind-beaten, gnarly limbs and having the longest lifespan on Earth, is losing a race to the top of mountains throughout the Western United States, putting future generations in peril, researchers said Wednesday. Driven by climate change, a cousin of the tree, the limber pine, is leapfrogging up mountainsides, taking root in warmer, more favorable temperatures and leaving little room for the late-coming bristlecone, a study finds. Researchers...